To make the section work you have to go to Admin Panel > Appearance > Customize > Homepage Sections > Special Items Section and enable the sections . Then add the IDs of the posts that you have created to display in this section in Input IDs field .
If the above steps does not help then please post your site URL so that we could inspect further .
Actually the correct location is not the one you mentioned , Please look carefully , the correct path is Admin Panel > Appearance > Customize > Homepage Sections > Special Items Section . Its Home page section not Homepage Settings. Hopefully this will clear the info .
And yes the IDs of Posts should be placed in Input IDs field .You can include more no of ID by separating with comma .
Also we are glad that we could help you .
If you have any issue further please feel free to post .
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